In a 10-inch skillet, cook bacon over medium heat 7 to 9 minutes, or until crisp. Drain bacon on paper towel and dice. In a small bowl, mix together mayonnaise, barbecue sauce, and salt with wire whisk until blended. In a large bowl, stir chicken, bacon, onion, jalapeño, and mayonnaise mixture until well mixed. Serve in lettuce leaves. Sprinkle with parsley.